projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b | 1 | /* |
| 6d2010ae | 2 | * Copyright (c) 1998-2010 Apple Computer, Inc. All rights reserved. |
| 1c79356b | 3 | * |
| 6d2010ae | 4 | * @APPLE_LICENSE_HEADER_START@ |
| 1c79356b | 5 | * |
| 2d21ac55 A |
6 | * This file contains Original Code and/or Modifications of Original Code |
| 7 | * as defined in and that are subject to the Apple Public Source License | |
| 8 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 6d2010ae A |
9 | * compliance with the License. Please obtain a copy of the License at |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 11 | * file. | |
| 2d21ac55 A |
12 | * |
| 13 | * The Original Code and all software distributed under the License are | |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 8f6c56a5 A |
15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 2d21ac55 A |
17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| 18 | * Please see the License for the specific language governing rights and | |
| 19 | * limitations under the License. | |
| 8f6c56a5 | 20 | * |
| 6d2010ae A |
21 | * @APPLE_LICENSE_HEADER_END@ |
| 22 | */ | |
| 23 | ||
| 24 | #include <architecture/i386/asm_help.h> | |
| 25 | ||
| 26 | TEXT | |
| 27 | ||
| 28 | /* | |
| 29 | * void | |
| 30 | * OSSpinLockUnlock(p) | |
| 31 | * int *p; | |
| 32 | * | |
| 33 | * Unlock the lock pointed to by p. | |
| 34 | */ | |
| 35 | ||
| 36 | LEAF(_OSSpinLockUnlock, 0) | |
| 37 | LEAF(_IOSpinUnlock, 0) | |
| 38 | LEAF(_ev_unlock, 0) | |
| 39 | movl $0, (%rdi) | |
| 40 | END(_OSSpinLockUnlock) | |
| 41 | ||
| 42 | ||
| 43 | /* | |
| 44 | * int | |
| 45 | * OSSpinLockTry(p) | |
| 46 | * int *p; | |
| 47 | * | |
| 48 | * Try to lock p. Return zero if not successful. | |
| 1c79356b | 49 | */ |
| b0d623f7 | 50 | |
| 6d2010ae A |
51 | LEAF(_OSSpinLockTry, 0) |
| 52 | LEAF(_IOTrySpinLock, 0) | |
| 53 | LEAF(_ev_try_lock, 0) | |
| 54 | xorl %eax, %eax | |
| 55 | orl $-1, %edx | |
| 56 | lock | |
| 57 | cmpxchgl %edx, (%rdi) | |
| 58 | setz %dl | |
| 59 | movzbl %dl, %eax | |
| 60 | END(_OSSpinLockTry) |